JP2009142031A - Stator for dynamo electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a dynamo electric machine which can reduce the possibility of such troubles as dielectric breakdown of a winding or short circuit through a simple arrangement while holding down the production cost low without reducing production efficiency. <P>SOLUTION: A stator 20 arranged concentrically with a rotor rotating about a core axis includes a tubular core member 30 having a plurality of tees on the inner circumferential part, a core holder 50 secured to a case 70 while holding the core member being press fitted along the core axis direction, an insulating member 40 in the shape of a bobbin attached to cover each tee and around which a coil 43 is wound, and a coating member 60 in the shape of a ring provided over the entire circumference of the core member 30 to abut against a part of each outer circumferential surface of the insulating member 40 close to the end face F of the core member 30 on the press fit side, wherein an annular enclosed space P is formed by the core holder 50, the end face F of the core member 30 on the press fit side and the coating member 60 by making the core holder 50 abut against the coating member 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine that is arranged concentrically with a rotor that rotates about an axis.

  2. Description of the Related Art Conventionally, a stator core member that constitutes a rotating electrical machine is formed in a cylindrical shape by a plurality of laminated thin plates. In such a configuration, in order to securely fix the laminated thin plates to the case as a single unit, the core holder is fitted into the core member from the outer peripheral side, and then the core holder and the case are fixed. It is preferable to be in this way.

  As a method of fitting the core holder into the core member, Patent Document 1 describes a method in which a core member composed of a plurality of divided cores positioned in an annular shape is press-fitted into the core holder.

  In Patent Document 2, a core holder that has been heated in advance and expanded in inner diameter by thermal expansion is fitted on the outer periphery of a core member composed of a plurality of divided cores positioned in an annular shape, and then the core holder is cooled. And shrinking the core member in the radial direction to perform so-called shrink fitting.

Japanese Patent Laid-Open No. 6-311675 JP-A-9-308141

  However, in a type in which the core member is press-fitted into the core holder as described in Patent Document 1, the end on the outer peripheral side of the core member and the inner peripheral surface of the core holder are rubbed with each other at the time of press-fitting, thereby generating shavings. Then, it adheres to the press-fitting side end face of the core member. When the rotating electrical machine operates, the shavings drop off due to the vibration and adhere to the coil portion, which can cause a failure such as a short circuit by destroying the insulating film of the coil.

  In addition, in the type in which the core holder is fitted on the outer periphery of the core member by shrink fitting as described in Patent Document 2, it is necessary to heat the core holder in advance, so an increase in production facilities is necessary. There is a problem that the production cost becomes high. Moreover, since it is necessary to heat above predetermined temperature at the time of production, there exists a problem that production efficiency will become low.

  The present invention has been made in view of the above problems, and with a simple configuration, reduces the possibility of occurrence of defects such as dielectric breakdown of the windings and short circuit without reducing the production cost and reducing the production efficiency. An object of the present invention is to provide a stator for a rotating electrical machine that can be used.

  In order to achieve this object, according to the present invention, the characteristic configuration of the stator for a rotating electrical machine arranged concentrically with the rotor rotating around the axis is formed in a cylindrical shape having a plurality of teeth portions on the inner peripheral portion. A core holder fixed to the case and covering each of the teeth portions, and a coil is wound around the outer periphery of the core member. And a bobbin-shaped insulating member that insulates between the core member and the coil, and a part of the outer peripheral surface of the insulating member that is close to the press-fitting side end surface of the core member, A ring-shaped covering member provided over the entire circumference of the core member, and the core holder and the covering member are brought into contact with each other, and are annularly formed by the core holder, the press-fitting side end surface of the core member, and the covering member. Sealed space It lies in the fact that form.

  According to this configuration, since the core holder is fitted into the core member by press fitting, it is not necessary to preheat the core holder. Therefore, the production cost can be kept low, and the production efficiency does not decrease.

  In addition, a covering member that contacts the outer peripheral surface of the insulating member that is mounted on each of the plurality of tooth portions of the core member is provided in a cylindrical shape over the entire periphery of the core member, and the core holder and the covering member are contacted. Since the annular sealed space is formed by the core holder, the press-fitting end surface of the core member, and the covering member, the outer peripheral end of the core member and the inner peripheral surface of the core holder are rubbed when the core member is press-fitted into the core holder. The resulting shavings can be confined within the space. Therefore, it is possible to prevent the shavings from reaching the coil portion with a very simple configuration, and to reduce the possibility of problems such as dielectric breakdown of the windings and short circuits.

  Here, it is preferable that the end of the core holder on the lower side with respect to the press-fitting direction of the core member is bent inward in the radial direction and is in contact with the outer peripheral surface of the covering member.

  According to this configuration, the annular sealed space can be easily formed simply by bending the end portion of the core holder inward in the radial direction, and the above-described effects can be obtained.

  Moreover, it is preferable even if the said covering member is extended to radial direction outer side, and is contact | abutting to the internal peripheral surface of the said core holder.

  According to this configuration, the annular sealed space can be easily formed simply by extending the covering member radially outward, and the effects as described above can be obtained.

  In the stator for a rotating electrical machine described so far, it is preferable that the core member is configured by combining the divided cores divided for each tooth portion in an annular shape.

  If the core member is formed by combining the divided cores divided for each tooth portion in an annular shape, the winding space factor can be improved and the efficiency of the rotating electrical machine can be increased. Therefore, according to this configuration, by adopting the structure as described so far when the split core is fitted into the core holder and fixed integrally, the production cost can be kept low with a simple configuration, such as a short circuit. While reducing the possibility of occurrence of defects, it is possible to make use of the merit of configuring the core member with a plurality of divided cores, that is, improving the efficiency of the rotating electrical machine.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the present invention is applied to a stator 20 for a motor 1 (electric motor) will be described.
FIG. 1 is a cross-sectional view showing an overall configuration of a motor 1 according to the present embodiment. FIG. 2 is a plan view showing the overall configuration of the stator 20 of the motor 1 according to the present embodiment, and FIG. 3 is an enlarged plan view thereof.

  As shown in FIG. 1, the motor 1 is a brushless type motor, and includes a rotor 10 and a stator 20. These are accommodated in the case 70.

  The rotor 10 is a rotor that is disposed around the inner periphery of the stator 20 with a predetermined interval and rotates about the axis Z.

  The stator 20 is a stator that is configured in a cylindrical shape as a whole and is arranged concentrically with the rotor 10. The stator 20 includes a core member 30, an insulating member 40, a coil 43, and a core holder 50. The motor 1 according to the present embodiment further includes a cylindrical covering member 60.

  The core member 30 has a plurality of teeth portions 32a on the inner peripheral portion and is formed in a cylindrical shape. In the present embodiment, the core member 30 is configured by annularly combining a plurality of divided cores 31 that are divided for each tooth portion 32a in a direction intersecting the circumferential direction in the yoke portion 32b. Each divided core 31 is formed by laminating a plurality of thin plates 33 having the same shape. The thin plate 33 uses an electromagnetic steel plate. Each of the split cores 31 receives pressure in the radial direction by the core holder 50, and the split cores 31 are held in contact with each other in the circumferential direction by the split surfaces, thereby being fixed and integrated with each other.

  The insulating member 40 is a bobbin-shaped member that electrically insulates between the core member 30 and the coil 43, and is mounted so as to cover each of the tooth portions 32 a of the split core 31. The insulating member 40 includes a coil housing portion 41c between the outer peripheral side flange portion 41a and the inner peripheral side flange portion 41b, and a predetermined number of wires having an insulating film are wound around the outer periphery of the coil housing portion 41c to form the coil 43. Constitute. In the drawing, the coil 43 is omitted. Thus, by winding the coil 43 in the state of the split core 31, the winding space factor can be improved, and the motor 1 can be made highly efficient. Therefore, the motor 1 can be reduced in size and output depending on the application.

  The core holder 50 is a ring-shaped holding member that holds a core member 30 in which a plurality of divided cores 31 are annularly combined. The core holder 50 includes a flange portion 51a, a holding portion 51b, and a bent portion 51c, and these components are integrally formed. The flange 51a extends radially outward from the end of the core holder 50, and the core holder 50 is fixed to the case 70 with a bolt 52 that passes through the flange 51a.

  As shown in FIGS. 4 and 5, the core member 30, which is temporarily fixed by combining the split cores 31 in an annular shape from the flange portion 51 a side, is press-fitted along the axis Z direction into the core holder 50. At the time of press-fitting, the outer peripheral side flange 41a of the insulating member 40 is press-fitted after being covered with a covering member 60 described later. The bent portion 51 c of the core holder 50 is bent radially inward on the lower side in the press-fitting direction than the press-fitting side end surface F of the core member 30, and the end of the bent portion 51 c abuts on the outer peripheral surface of the covering member 60.

  Incidentally, the insulating member 40 is attached to the tooth portion 32 a of the split core 31. At this time, the height of the outer peripheral side flange 41a of the insulating member 40 is slightly higher than the thickness of the coil. On the other hand, the teeth 32a of the split core 31 has a narrower circumferential width than the yoke 32b. In many cases. Therefore, the circumferential width of the outer peripheral side flange portion 41 a of the insulating member 40 is narrower than the width of the yoke portion 32 b of each divided core 31. Therefore, in the state where the plurality of divided cores 31 are annularly combined, as shown in FIG. 6, there is a gap E between the outer peripheral side flanges 41a of the insulating members 40 of the divided cores 31 adjacent to each other. End up.

  In the motor 1 according to the present embodiment, the covering member 60 is provided so as to fill the gap E. The covering member 60 is a ring-shaped member that is in contact with a portion of the outer peripheral surface of the insulating member 40 that is close to the press-fitting side end surface F of the core member 30 and is provided over the entire periphery of the core member 30. In the present embodiment, the insulating member 40 is provided over the entire circumference of the core member 30 in contact with the outer peripheral side flange 41a. The covering member 60 is formed by injection molding a thermosetting resin such as an epoxy resin or a phenol resin. If the covering member 60 is formed using the resin material in this way, even if the shape formed by connecting the outer peripheral side flange portion 41a deviates from a perfect circle due to the presence of the gap E, the distortion is caused by the elasticity of the resin material. Each outer peripheral surface of the insulating member 40 can be covered while absorbing. Further, the thickness of the covering member 60 is slightly larger than the clearance between the outer peripheral side flange 41a of the insulating member 40 and the end of the bent portion 51c of the core holder 50, and the core member 30 is press-fitted into the core holder 50. Sometimes, the covering member 60 is moderately tightened between the insulating member 40 and the core holder 50.

  It is also preferable that the end of the bent portion 51c of the core holder 50 is further bent toward the upper side in the press-fitting direction. In this way, when the core member 30 is press-fitted into the core holder 50, the end of the bent portion 51c and the covering member 60 can be appropriately slid.

  Thus, the covering member 60 is provided over the entire periphery so as to cover the outer peripheral surface of the outer peripheral side flange 41a of the insulating member 40, and the gap E described above is filled. Further, as shown in FIG. 7, the end portion of the bent portion 51 c of the core holder 50 is bent radially inwardly on the lower side of the press-fitting direction than the press-fitting side end surface F of the core member 30, and is formed on the outer peripheral surface of the covering member 60. Since they are in contact with each other, the annular sealed space P is formed by the core holder 50, the press-fitting side end face F of the core member 30, and the covering member 60.

  The annular sealed space P is generated when the outer peripheral side end of the core member 30 and the inner peripheral surface of the core holder 50 are rubbed with each other when the core member 30 is press-fitted into the core holder 50. It fulfills the function of confining the shavings S adhering to the inside. Therefore, even if the shavings S fall off from the press-fitting side end face F of the core member 30 due to vibration when the motor 1 is operated, it remains in the annular sealed space P. Therefore, it is possible to prevent the shavings S from reaching the coil 43 and reduce the possibility of occurrence of problems such as dielectric breakdown of the winding and short circuit.

  The core holder 50, which is one of the members that form the annular sealed space P, is a member that is originally used for holding the core member 30 and fixing it to the case 70. Therefore, the increase in the number of parts for forming the sealed space P can be minimized. Furthermore, the covering member 60 can be mass-produced inexpensively by injection molding or the like in a short time. Therefore, the production cost can be kept low also from these points.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to the drawings.
The overall configuration of the motor 1 according to this embodiment is substantially the same as the overall configuration of the motor 1 according to the first embodiment described above, but the specific structure of the stator 20 is partially different. Hereinafter, this difference will be described.

  FIG. 8 is a cross-sectional view showing the structure of the stator 20 according to this embodiment. In the present embodiment, the core holder 50 is not provided with the bent portion 51c in the first embodiment, and the lower side in the press-fitting direction extends along the case 70 from the holding portion 51b. On the other hand, the covering member 60 is provided over the entire circumference so as to cover the outer peripheral surface of the outer peripheral side flange 41a of the insulating member 40, and extends radially outward from the outer peripheral side flange 41a of the insulating member 40, The end portion of the extending portion 61 is in contact with the inner peripheral surface of the core holder 50. Accordingly, an annular sealed space P is formed by the core holder 50, the press-fitting side end face F of the core member 30, and the covering member 60.

  In this example, the extending portion 61 is formed near the center with respect to the width of the covering member 60 in the axis Z direction so that the posture of the covering member 60 is stabilized after the core member 30 is press-fitted into the core holder 50. Has been. Further, the end portion of the extending portion 61 and the inner peripheral surface of the core holder 50 are in contact with each other while exerting a constant pressing load. Therefore, the annular sealed space P can be formed firmly.

  As described above, in the present embodiment, the covering member 60 is provided over the entire periphery so as to cover the outer peripheral surface of the outer peripheral side flange 41a of the insulating member 40, and extends outward in the radial direction. An end of 61 abuts on the inner peripheral surface of the core holder 50 to form an annular sealed space P. Therefore, also in this case, the shavings S generated during press-fitting can be confined in the inside, and the possibility of occurrence of problems such as dielectric breakdown of the windings and short circuit can be reduced with a simple configuration.

[Other Embodiments]
(1) In each of the above embodiments, the core holder 50 is bent radially inward and abuts against the outer peripheral surface of the covering member 60 to form the annular sealed space P, and the covering member 60 is radially outward. The example which extended and contact | abutted to the internal peripheral surface of the core holder 50, and formed the cyclic | annular sealed space P was demonstrated. However, it is sufficient that at least the core holder 50 and the covering member 60 are in contact with each other to form the annular sealed space P. For example, the covering member 60 is radially outward while the core holder 50 is bent radially inward. It is possible to have a structure that extends at the edge and abuts at the edge.

(2) In each of the above embodiments, the example in which the covering member 60 is provided over the entire circumference of the core member 30 in contact with the outer peripheral side flange 41a of the insulating member 40 has been described. However, the covering member 60 does not necessarily need to be in contact with the outer peripheral side flange portion 41 a of the insulating member 40, and may be in contact with any part close to the press-fitting side end face F of the coreless member 30.

(3) In each of the above-described embodiments, the example in which the core member 30 is configured by combining the split cores 31 in an annular shape has been described. However, as the core member 30, an integral core in which the yoke portion 32b is integrated in the circumferential direction may be used.

(4) In each of the above embodiments, the example in which the present invention is applied to the stator 20 for the motor (electric motor) 1 has been described. However, it is applicable not only to the motor 1 but also to a generator (generator) that generates electric power by rotation input from a rotating shaft, and a motor / generator stator 20 that functions as both a motor and a generator as required. can do.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a stator for a rotating electrical machine that is arranged concentrically with a rotor that rotates around an axis.

Sectional view showing the overall configuration of the motor Plan view showing the overall configuration of the stator Enlarged plan view showing how the split cores fit together The perspective view which showed the mode of the press injection of the core member to a core holder Sectional view showing the state of press-fitting the core member into the core holder Front view with split cores combined in a ring Sectional drawing which shows the structure of the stator which concerns on 1st embodiment Sectional drawing which shows the structure of the stator which concerns on 2nd embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 10 Rotor 20 Stator 30 Core member 32a Teeth part 40 Insulating member 43 Coil 50 Core holder 60 Cover member 70 Case Z Axis core P Annular sealed space F Press-fit side end face

Claims (4)

A stator arranged concentrically with a rotor rotating around an axis;
A core member formed in a cylindrical shape having a plurality of teeth on the inner periphery;
A core holder fixed to the case while holding the core member press-fitted along the axial direction;
A bobbin-shaped insulating member that is mounted so as to cover each of the teeth portions, a coil is wound around the outer periphery thereof, and insulates between the core member and the coil;
A ring-shaped covering member that is in contact with a portion of the outer peripheral surface of each of the insulating members that is close to the press-fitting side end surface of the core member and is provided over the entire periphery of the core member,
A stator for a rotating electrical machine in which the core holder and the covering member are brought into contact with each other, and an annular sealed space is formed by the core holder, the press-fitting side end surface of the core member, and the covering member.   2. The stator for a rotating electrical machine according to claim 1, wherein an end portion of the core holder on a lower side with respect to a press-fitting direction of the core member is bent radially inward and is in contact with an outer peripheral surface of the covering member.   The stator for a rotating electrical machine according to claim 1, wherein the covering member extends outward in the radial direction and is in contact with an inner peripheral surface of the core holder.   The stator for a rotating electrical machine according to any one of claims 1 to 3, wherein the core member is formed by annularly combining divided cores divided for each tooth portion.

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